[BUG] "Context left until auto-compact" text displayed vertically causing UI layout issue

[BUG] "Context left until auto-compact" text displayed vertically in TUI

Description

The "Context left until auto-compact: X%" text in Claude Code's TUI is being displayed vertically (one character per line) on the right side of the terminal, causing a severe UI layout issue.

Environment

• Claude Code version: 2.1.27
• OS: Windows (MSYS_NT-10.0-26220 3.6.5-22c95533.x86_64)
• Terminal: Git Bash
• Terminal width: 80 columns

Steps to Reproduce

1. Launch Claude Code 2.1.27
2. Use Claude Code until context usage reaches a certain level
3. Observe the right side of the terminal

Expected Behavior

The "Context left until auto-compact: X%" message should be displayed horizontally, either:

• In the status bar (horizontally)
• As a popup notification
• Or in any other reasonable horizontal format

Actual Behavior

The text is displayed vertically on the right side of the terminal, with each character on a separate line:

C
o
n
t
e
x
t

l
e
f
t

u
n
t
i
l

a
u
t
o
-
c
o
m
p
a
c
t
:

1
%

Screenshot

User reported seeing this issue in their Claude Code session. The vertical text appears on the right side of the terminal, making the UI look broken.

Impact

• Severely affects UI aesthetics
• Takes up valuable screen space
• Reduces usability and user experience
• Makes the interface look broken

Possible Cause

This appears to be a TUI layout bug where:

1. The text container width is incorrectly set to 1 character
2. Or the flexbox/grid layout is miscalculated
3. Or the terminal width detection is incorrect

Additional Context

• The issue occurs regardless of custom statusline configuration
• The top status bar displays correctly (horizontally)
• Only the right-side "Context left" text is affected
• This appears to be a new feature in recent Claude Code versions

Related Issues

• #15005 - Context low warning calculation issues
• #18080 - Feature request for compact count tracking

Suggested Fix

1. Short-term: Move the "Context left" information to the status bar (horizontal display)
2. Medium-term: Fix the TUI layout to ensure proper text container width
3. Long-term: Add responsive layout that adapts to terminal width